A visible light photocatalyst modified pvdf ultrafiltration membrane and its preparation method and application

A photocatalyst and nanophotocatalyst technology, applied in the field of PVDF ultrafiltration membrane and its preparation, to achieve the effect of inhibiting the formation of biofilm on the surface of the membrane, good synchronous anti-pollution and antibacterial effects, and high hydrophilicity

Active Publication Date: 2021-05-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By using a new visible light photocatalyst CdS / g-C 3 N 4 / rGO replaces ultraviolet light photocatalyst to blend and modify PVDF membrane, so that the prepared modified PVDF membrane has good anti-pollution and antibacterial properties under the irradiation of visible light, so as to solve PVDF membrane in an energy-saving, environmentally friendly and sustainable way Biofouling problems in water treatment

Method used

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  • A visible light photocatalyst modified pvdf ultrafiltration membrane and its preparation method and application
  • A visible light photocatalyst modified pvdf ultrafiltration membrane and its preparation method and application
  • A visible light photocatalyst modified pvdf ultrafiltration membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) CdS / g-C 3 N 4 Preparation of / rGO nanophotocatalyst

[0046] Firstly, a sufficient amount of cadmium sulfide (CdS), graphitic carbon nitride (g-C 3 N 4 ) and graphene oxide (GO), weigh 100mg g-C 3 N 4 Disperse in 30 mL of methanol by ultrasonication for 60 min, add 1 g of CdS, stir and mix for 20 h, remove the remaining methanol with a rotary evaporator, and dry the product at 50°C to obtain CdS / g-C 3 N 4 ; Weigh 50mg GO ultrasonically for 20min and disperse in the mixed solution of 100mL ethanol and water, wherein the volume ratio of ethanol to water is 1:3, then add the above CdS / g-C 3 N 4 , sonicate for 20 minutes and stir for 40 minutes, and centrifuge at 7000 rpm; redisperse the obtained precipitate in 80 mL of deionized water, adjust the pH of the solution to 8.5 with ammonia water, add 0.5 mL of hydrazine hydrate with a concentration of 30% and transfer it to an autoclave Hydrothermal reaction at 80°C for 2h, natural cooling and washing with deionized...

Embodiment 2

[0055] (1) CdS / g-C 3 N 4 Preparation of / rGO nanophotocatalyst

[0056] First prepare sufficient amount of CdS, g-C 3 N 4 and GO, weighed 100mg g-C 3 N 4 Disperse in 40mL methanol by ultrasonication for 70min, add 1.5g CdS, stir and mix for 24h, remove the remaining methanol with a rotary evaporator, and dry the product at 60°C to obtain CdS / g-C 3 N 4 ; Weigh 75 mg GO and ultrasonically disperse it in 120 mL of ethanol and water mixed solution for 25 min, wherein the volume ratio of ethanol to water is 1:3, and then add the above CdS / g-C 3 N 4 , sonicate for 25 minutes and stir for 50 minutes, and centrifuge at 7500 rpm; redisperse the obtained precipitate in 90 mL of deionized water, adjust the pH of the solution to 9.0 with ammonia water, add 0.8 mL of hydrazine hydrate with a concentration of 30% and transfer it to an autoclave Hydrothermal reaction at 85°C for 2h, natural cooling and washing with deionized water for 3 times, the product was vacuum-dried at 60°C to ...

Embodiment 3

[0066] (1) CdS / g-C 3 N 4 Preparation of / rGO nanophotocatalyst

[0067] First prepare sufficient amount of CdS, g-C 3 N 4 and GO, weighed 100mg g-C 3 N 4 Disperse in 50mL of methanol by ultrasonication for 80min, add 2g of CdS, stir and mix for 30h, remove the remaining methanol with a rotary evaporator, and dry the product at 70°C to obtain CdS / g-C 3 N 4 ; Weigh 100mg GO and ultrasonically disperse it in 150mL of ethanol and water mixed solution for 30min, wherein the volume ratio of ethanol to water is 1:3, and then add the above CdS / g-C 3 N 4 , ultrasonicated for 30min and stirred for 60min, centrifuged at 8000rpm; redispersed the obtained precipitate in 100mL deionized water, adjusted the pH of the solution to 9.5 with ammonia water, added 1mL of hydrazine hydrate with a concentration of 30% and transferred it to an autoclave. Hydrothermal reaction at 90°C for 2.5h, natural cooling and washing with deionized water for 3 times, the product was vacuum-dried at 70°C t...

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Abstract

The invention relates to a PVDF ultrafiltration membrane modified by a visible light photocatalyst and its preparation method and application. The ultrafiltration membrane is CdS / g-C 3 N 4 / rGO nano photocatalyst modified PVDF ultrafiltration membrane, in the ultrafiltration membrane, PVDF is used as the matrix, CdS / g‑C 3 N 4 / rGO nano photocatalyst is used as the active component, and the active component is evenly distributed in the matrix; the ultrafiltration membrane is prepared from components including the following parts by weight: 17-19 parts of polyvinylidene fluoride, 2.5-3.5 parts of polyvinylpyrrolidone Parts, N,N-Dimethylacetamide 77-79 parts, CdS / g-C 3 N 4 / rGO nano photocatalyst 0.3-1.3 parts; modified PVDF ultrafiltration membrane is used in anti-membrane organic pollutants or antibacterial. Compared with the prior art, the modified membrane provided by the invention has high hydrophilicity and good photocatalytic activity, and can effectively reduce membrane pore blockage caused by organic pollutants under visible light irradiation, and is resistant to Gram bacteria represented by Escherichia coli Negative bacteria and Gram-positive bacteria represented by Staphylococcus aureus have a good killing effect, can significantly inhibit the formation of biofilm on the membrane surface, and have good simultaneous anti-pollution and antibacterial effects.

Description

technical field [0001] The invention belongs to the technical field of membrane separation in water treatment, and relates to a CdS / g-C 3 N 4 / rGO visible light photocatalyst modified PVDF ultrafiltration membrane and its preparation method and application. Background technique [0002] Membrane separation technology is one of the preferred technologies in the field of water pollution control engineering. Due to its low cost, good effluent quality, high degree of intensification, simple equipment, and convenient operation, it is widely used in drinking water purification and sewage, wastewater treatment and reuse. middle. However, membrane fouling, especially membrane biofouling, often leads to the attenuation of membrane flux, the increase of operating costs and the shortening of membrane service life, which has become the main obstacle to the wide application of membrane separation technology in drinking water and sewage and wastewater treatment. [0003] Polyvinylidene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/14B01D65/02B01D65/08B01D71/34C02F3/12B01J31/06B01J27/24B01J35/06
CPCB01D61/145B01D65/022B01D65/08B01D67/0079B01D69/02B01D71/02B01D71/024B01D71/34B01D2321/34B01D2325/10B01D2325/48B01J27/24B01J31/06B01J35/0013B01J35/004B01J35/065C02F3/1268Y02W10/10
Inventor 王亚宜倪凌峰
Owner TONGJI UNIV
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